Alaska earthquakes

M5.4 earthquake 48 km ESE of Fox River, Alaska

A magnitude 5.4 earthquake struck 48 km ESE of Fox River, Alaska on Thu, Oct 30, 2025, 9:33 AM AKDT (17:33 UTC), 24 km (15 mi) below the surface.

Fox River forecast More in Alaska

Map

Where this earthquake was located, with the others nearby. Select one for its page.

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The earthquake

Magnitude: 5.4 (ML, local (Richter)), moderate
Magnitude from: Alaska Earthquake Center
Local time: Thu, Oct 30, 2025, 9:33 AM AKDT
UTC: 2025-10-30 17:33:14 UTC
Depth: 23.6 km (14.7 mi), shallow
Epicenter: 59.631° N, 150.233° W
Region: Alaska
Felt reports: 2,179
Strongest shaking: V, moderate shaking
PAGER alert: Green
Tsunami flag: Yes: a large quake in an oceanic region
Status: Reviewed by a seismologist

Magnitude estimates

Different scales measure different things and differ by a few tenths. The USGS marks one as preferred, and it is the one this page uses.

Mag.	Scale	Computed by	Notes
5.4	ML, local (Richter)	Alaska Earthquake Center	Preferred · Preliminary
5.4	Mww, W-phase moment	USGS National Earthquake Information Center	Reviewed · ±0.041 · 58 stations
5.1	Mi	NOAA National Tsunami Warning Center	Reviewed · 22 stations
5.6	Mi	NOAA Pacific Tsunami Warning Center	First automatic solution · Reviewed · 10 stations
5.3	Mwr, regional moment	USGS National Earthquake Information Center	Moment tensor · Reviewed
5.3	Mwb, body-wave moment	USGS National Earthquake Information Center	Moment tensor · Reviewed
5.4	Mww, W-phase moment	USGS, automatic first solution	First automatic solution · Confirmed

Tsunami

The USGS flags a quake this large in an oceanic region. The flag does not mean a tsunami happened; the tsunami warning centers decide that, and their messages are below when they issued any.

Tsunami Information Statement from the NTWC. Read the message

Current tsunami warnings: tsunami.gov. Warnings in force in the US also appear on our alerts pages.

Shaking

The USGS ShakeMap: shaking estimated from seismic stations and the quake’s size, on the Modified Mercalli intensity scale.

Strongest estimated: V, moderate shaking
Peak ground acceleration: 10.0% of gravity
Peak ground velocity: 4.6 cm/s
Map: Automatic

USGS ShakeMap: estimated shaking intensity around the epicenter — Estimated shaking intensity. Map: USGS ShakeMap.

Did you feel it?

2,179 people reported to the USGS what they felt; the strongest reported shaking was VI, strong shaking.

Estimated impact

The USGS PAGER system estimates deaths and economic losses from the shaking and the population and buildings exposed to it.

Alert level: Green: little or no damage or loss of life expected

Deaths: estimated chance of each range
Range	Chance
Under 1	69%
1 to 10	29%
10 to 100	2%
100 to 1,000	Under 1%
1,000 to 10,000	Under 1%
10,000 to 100,000	Under 1%
100,000 to 10,000,000	Under 1%

Economic losses: estimated chance of each range
Range, million USD	Chance
Under 1	65%
1 to 10	30%
10 to 100	4%
100 to 1,000	Under 1%
1,000 to 10,000	Under 1%
10,000 to 100,000	Under 1%
100,000 to 10,000,000	Under 1%

Aftershock forecast

The chance of at least one aftershock this large or larger, from the USGS operational aftershock forecast, issued Thu, Oct 1, 2026, 5:33 PM UTC. The USGS updates it as the sequence unfolds.

Within	M3+	M4+	M5+	M6+	M7+
1 day	Under 1%	Under 1%	Under 1%	Under 1%	Under 1%
1 week	1%	Under 1%	Under 1%	Under 1%	Under 1%
1 month	5%	Under 1%	Under 1%	Under 1%	Under 1%
1 year	33%	5%	Under 1%	Under 1%	Under 1%

In the coming week the USGS expects about 0 aftershocks of magnitude 3 or more, and most likely between 0 and 0.

Fault motion and ground failure

How the rock slipped, from the moment tensor, and the USGS estimate of landslides and liquefaction.

Faulting: Oblique normal
Moment magnitude: 5.4 Mww
Nodal plane 1: Strike 291°, dip 46°, rake -133°
Nodal plane 2: Strike 164°, dip 58°, rake -54°

How well it is located

Reviewed by a seismologist.

Stations used: 185

Nearest places

Distance and direction from each place to the epicenter, with its forecast.

Nearby

Within 100 km, magnitude 2.4 and up: 29 in the 60 days after this one and 4 in the 30 days before it.

After

Before

Earthquakes today Alaska earthquakes Live radar here

Sources

From the USGS Earthquake Hazards Program and its partner networks, event ak025dxe5mlz (also filed as at00t4ygrd, usauto6000rker, pt25303000, us6000rker). Read Sat, Oct 3, 2026, 3:15 PM UTC.